JP3631914B2 - How to open a plastic bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bag opening method, and more specifically, one edge of an opening is extended and shifted, and a pin is inserted into two pin holes provided on the one edge to open one bag at a time. It relates to the opening method.
[0002]
[Prior art]
In an apparatus for packing an article in a plastic bag for packaging, it is necessary to open the stacked and held bags one by one.
In order to facilitate the operation of laminating packaging bags and opening them one by one, conventionally, as shown in FIG. Two pin holes 03 are provided on the extended edge 02, and the pins 04 are inserted into the pin holes 03 and held in a stacked state as shown in FIG. 5, and the bags 01 in this state are opened one by one. The method of putting goods in is used.
[0003]
As shown in FIG. 5, when the bags held by the pins 04 inserted into the pin holes 03 are opened and used one by one, the bags 01 must be removed from the pins 04. Conventionally, an article is put into a bag with the pin 04 inserted into the pin hole 03, and the bag is torn off at the pin hole 03 portion using the force at that time.
[0004]
In this case, although the plastic bag or the like has a considerable tensile strength even though it is torn off at the pin hole 03 portion, a perforation or a cut 05 is made from the pin hole 03 so as to be easily torn at the pin hole 03 portion.
If this perforation or cut 05 enters too much, the bag will tear off immediately and the filling operation will be hindered. Also, if the perforation or cut is insufficient, the bag will not be broken. The filling operation was disturbed.
[0005]
In this way, one edge of the opening is extended and shifted, and an operation is performed in which a pin is inserted into two pin holes provided on the one edge to open the held bags one by one and fill the goods. There was considerable difficulty.
In addition, even if the bag is torn off successfully, a broken piece remains in the pin hole 03 portion of the bag torn at the pin hole 03 portion, and the appearance of the packaged product is impaired in such a bag, This type of bag packaging has become a major problem.
[0006]
[Problems to be solved by the invention]
In the present invention, when one edge of the opening is extended and shifted, and the bags held by inserting the pins into the two pin holes provided on the one edge are opened one by one, the pin holes It is an object of the present invention to provide a bag opening method that can be opened without breaking the bag.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an opening of a bag in which one edge of an opening is extended and a bag is inserted and held one by one in two pin holes provided on the edge. In the method, a pin whose upper end is opened upward is inserted into the pin hole, and air is blown obliquely from above toward the opening of the bag while holding the extended edge between the two pin holes. Forming an opening in the bag and inserting an opening member having a width narrower than the interval between the two pin holes in the opening and extending in the vertical direction between the two pin holes to expand the opening. A method for opening a bag is provided.
[0008]
In the bag opening method according to the present invention, one edge of the opening is extended and shifted, and a portion provided with two pin holes is pressed between the two pin holes and directed toward the bag opening. Since air is blown obliquely from above, the bags are partially opened while being held in the stacked position.
[0009]
When an opening member having a width narrower than the interval between the two pin holes and extending in the vertical and horizontal directions is inserted between the two pin holes to expand the opening, the bag is extended. The lower edge thus formed is lifted upward except for the portion pressed in the middle of the pin hole, whereby the pin hole comes out of the pin whose upper end is opened upward.
[0010]
As described above the bag is expanded open mouth off the pin without torn off, a state that can accept the goods to be packaged.
In the bag thus opened, there is no broken piece in the vicinity of the pin hole like the conventional one, and a packaged product having an excellent appearance can be produced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the plastic bag opening method according to the present invention will be described in detail based on the embodiment shown in FIGS.
1 to 3, reference numeral 1 denotes a packaging plastic bag, except for the opening 0. One edge of the opening 0, that is, the lower edge 2 in the figure is extended, and the extended edge 2 is formed with two pin holes 3 spaced from each other.
[0012]
The plastic bag 1 formed in this way is read and overlaid, and two pins 4 opened upward are inserted into the pin holes 3 and held. The laminated plastic bag 1 is pressed by an appropriate holding member 5 on the edge 2 extended between the pin holes 3.
[0013]
As described above, when air 7 is blown by the air nozzle 6 obliquely from above toward the opening 0 of the plastic bag held in a laminated state, the opening 0 of the top bag is as shown by the solid line 8 in FIG. Is opened.
Thus, the opening member 9 is inserted into the opening formed by the air 7 from the air nozzle 6. The opening member 9 has four bars, a lower bar 9-1 (two bars) and an upper bar 9-2 (two bars) that can expand and contract each other.
[0014]
After the opening member 9 is inserted into the opening of the bag, the upper bar 9-2 is displaced upward to expand the opening of the bag as indicated by the phantom line 10.
The pin hole 3 into which the pin 4 has been inserted is pulled out of the pin 4 whose upper end is opened by the partial opening operation of the bag by the air 7 or the expansion operation of the opening by the opening member 9. Will not be broken at pin hole 3.
[0015]
After the bag 1 is opened to the maximum extent by the opening member 9 in this way, the goods to be packaged are filled into the bag from the opening.
It is to be noted that the pressing force of the holding member 5 is weakened at an appropriate time before filling, filling operation, or after filling into the bag 1 so that the uppermost opened bag 1 is released from the laminated state. Good.
As the opening member 9, is inserted into the opening of the bag 1, the upper and lower Direction its opening, or depending on what was configured to spread vertically and horizontally, such as the shape and size of the bag to be opened May be appropriately selected and used.
[0016]
The present invention has been specifically described above based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and the specific structure and configuration are within the scope of the present invention shown in the claims. Needless to say, various changes may be made.
[0017]
For example, in the above-described embodiment, the opening member 9 has a structure in which the upper bar 9-2 is displaced straight upward to widen the opening of the bag. However, the four bars are 45 ° each. An opening member configured to expand the opening by being displaced obliquely upward and downward may be used. In short, a well-known opening expansion member of this type may be appropriately employed.
[0018]
【The invention's effect】
As described above, the present invention provides a bag opening method in which one edge of an opening is extended, and a pin is inserted into two pin holes provided on the one edge to open the held bags one by one. The pin hole is inserted into and held by a pin whose upper end is opened upward, and air is blown from above obliquely toward the opening of the bag while pressing the extended edge between the two pin holes. An opening is formed in the bag, and an opening member having a width narrower than the interval between the two pin holes and extending in the vertical direction is inserted between the two pin holes to expand the opening. A method for opening a bag is provided.
[0019]
According to this opening method, the edge of the bag opening is shifted and the extended portion is opened while pressing between the two pin holes, so that the pin hole is pulled out from the pin during the opening process, and the pin The hole can be opened without breaking the bag.
Therefore, according to the bag opening method of the present invention, it is possible to produce a bag packaged product without a portion torn to the opening.
[Brief description of the drawings]
FIG. 1 is a plan view showing a laminated plastic bag to which an opening method according to the present invention is applied.
FIG. 2 is an explanatory view showing a state in which the opening method according to the present invention is performed on the plastic bag shown in FIG. 1;
FIG. 3 is a side view of FIG.
4 is a cross-sectional view of the bag shown in FIG. 1. FIG.
FIG. 5 is a perspective view showing a conventional bag opening method.
[Explanation of symbols]
0 Opening portion 1 Plastic bag 2 Lower edge 3 Pin hole 4 Pin 5 Holding member 6 Air nozzle 7 Air 9 Opening member 9-1 Lower bar 9-2 Upper bar

Claims (1)

In a bag opening method in which one edge of an opening is extended and a plastic bag held by inserting a pin into two pin holes provided on the one edge is opened one by one, the upper end of the pin hole being upward Inserted and held in a pin opened toward the two, while holding the extended edge between the two pin holes while blowing air from above diagonally toward the opening of the bag, to form an opening in the bag, An opening method for a plastic bag, wherein an opening member having a width narrower than an interval between the two pin holes in the opening and extending in the vertical direction is inserted between the two pin holes to expand the opening.

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